Jörg Breuning likes to share! 
Specialized Green Roof installation companies are the backbone of the American Green Roof market. Without their passion, their knowledge, experience, and hands-on skills Green Roofs would hardly exist or never maintained.
It is sad to see that large corporations take these valuable resources for granted by squeezing the last cent from installers or forcing them to utilize components that create more problems that solutions - all just for the corporate profit's sake or keeping share holders happy.
Solar Garden Roof is Open Source and everyone can call it their system!